Q: Which of the following best describes the central dogma of molecular biology?

$$\text{DNA} \rightarrow \text{RNA} \rightarrow \text{Protein}$$

Question 1

Which of the following statements best summarizes the modern cell theory as established by Schwann and Virchow?

Accepted Answer

All organisms are composed of one or more cells, and all cells arise only from preexisting cells.

Question 2

A scientist wants to observe the three-dimensional surface structure of a pollen grain at very high magnification. Which microscopy technique should she use?

Accepted Answer

Scanning electron microscopy (SEM)

Question 3

Which of the following units would be most appropriate for measuring the diameter of a ribosome?

Accepted Answer

Nanometer (nm)

Question 4

Which historical experiment first demonstrated that a compound made in a living organism could be synthesized in the laboratory, challenging the idea of 'vitalism'?

Accepted Answer

Fredrich Wöhler’s synthesis of urea

Question 5

A researcher uses a fluorescent antibody to detect the presence of a specific protein in a living cell. Which microscopy technique is she most likely using?

Accepted Answer

Fluorescence microscopy

Question 6

Which of the following best describes the central dogma of molecular biology?

Accepted Answer

$$	ext{DNA} ightarrow 	ext{RNA} ightarrow 	ext{Protein}$$

Question 7

Which of the following methods would be most appropriate for separating proteins based on their size and charge?

Accepted Answer

Electrophoresis

Question 8

A scientist is studying a metabolic pathway and wants to isolate mitochondria from a cell homogenate. Which technique should she use?

Accepted Answer

Subcellular fractionation using centrifugation

Question 9

Which of the following statements about CRISPR genome editing is correct?

Accepted Answer

A guide RNA directs the Cas9 protein to a specific DNA sequence, where a double-stranded break is introduced.

Question 10

Which of the following is a key advantage of using model organisms in cell biology research?

Accepted Answer

They are well-characterized and easy to manipulate, allowing for reproducible experiments.

Question 11

A scientist wants to determine the sequence of all the genes in a newly discovered bacterium. Which field of study does this research belong to?

Accepted Answer

Genomics

Question 12

Which of the following statements about scientific 'facts' is most accurate according to modern cell biology?

Accepted Answer

Scientific facts are provisional and subject to change as new evidence emerges.

Question 13

Which of the following best describes the difference between in vivo and in vitro experiments?

Accepted Answer

In vivo experiments are performed in living organisms, while in vitro experiments are performed outside living organisms.

Question 14

Which of the following is NOT a correct pairing of a model organism and its common use?

Accepted Answer

Mus musculus (mouse) – study of plant photosynthesis

Question 15

Which of the following statements about the resolving power of microscopes is correct?

Accepted Answer

The electron microscope has a much greater resolving power than the light microscope, allowing visualization of much smaller structures.

Question 16

A scientist is using mass spectrometry in her research. What is she most likely trying to determine?

Accepted Answer

The size and composition of individual proteins

Question 17

Which of the following is a correct description of the process of DNA cloning?

Accepted Answer

Generation of many copies of a specific DNA sequence

Question 18

Which of the following is a real-world application of transcriptomics?

Accepted Answer

Studying which genes are actively transcribed in cancer cells compared to normal cells

Question 19

Which of the following best describes the role of reverse transcriptase in molecular biology?

Accepted Answer

It synthesizes complementary DNA from an RNA template.

Question 20

A scientist is designing an experiment to test a new hypothesis about protein synthesis. According to the scientific method, what should she do first?

Accepted Answer

Search the scientific literature for peer-reviewed sources.

Chapter 1: A Preview of Cell Biology – Foundations, Methods, and Modern Approaches

Guida di studio - Domande di pratica

Study guide - Flashcard